I looked at that stuff when I was in Wal Mart Pharmacy looking for Propylene Glycol (to which, they directed me straight to Mira-Lax, which is Polyethylene Glycol, and a laxative) Pink/purple label, right?
I see that is was designed for topical use, to be diluted with water and used on skin. There are no ingredients listed, or mention of any additional mixers. There is *no listing of purity that I can remember*. Will I put it on my skin? sure thing. In my lungs? heck no.
I said "bosh" and ordered both from Diyflavorshack...$4.50, for enough to last me years...ok, 4 ounces?
Side note, I also checked Walgreens, they also tried to send me to the mira-lax aisle, once corrected, they can order propylene glycol for $20 for a pint of the stuff. They were clue free on veggie glycerin.